In reference, update, and insertion processing, the lock of an un-transferred object is released, and then the lock of a transferred object is set when the pointer is traced for transfer between objects to thereby improve the parallel execution capability of the reference, update, and insertion. The applicator receiving the metal lids from an infeed conveyor and discharging the metal lids with sealant thereon to a discharge conveyor. A portion of the brown grease, which would normally be transported to an end user, is retained in a separate holding vessel at the grease processing site.